Circumferential array borehole evaluation tool

A system for downhole cement inspection, comprising:

• a tool body;
• an omnidirectional acoustic transmitter coupled to the tool body;
• an acoustic receiver of a first array of acoustic receivers coupled to and positioned around the circumference of the tool body at a first distance from the acoustic transmitter, wherein the first array of acoustic receivers comprises a first plurality of acoustic receivers;
• a second array of acoustic receivers coupled to and positioned around a circumference of the tool body at a second distance from the acoustic transmitter, wherein the second array of acoustic receivers comprises a second plurality of acoustic receivers, wherein the second distance is greater than the first distance, wherein each acoustic receiver of the first array of acoustic receivers is at a different angular orientation, and wherein the acoustic receiver of the second array of acoustic receivers is circumferentially aligned with a different acoustic receiver of the first array of acoustic receivers with respect to the tool body;
• and
• a first information handling system communicably coupled to the acoustic receiver and the first array of acoustic receivers, wherein the information handling system comprises a processor and a memory device coupled to the processor, the memory device containing a set of instruction that, when executed by the processor, causes the processor to
• receive a first measurement from the acoustic receiver;
• receive a second measurement from the second array of acoustic receivers;
• generate a first visualization based, at least in part, on the first measurement, the first visualization corresponding to a first bond between a downhole casing and a cement layer;
• and
• generate a second visualization based, at least in part, on the second measurement, the second visualization corresponding to a second bond between the cement layer and a formation.

A method for downhole cement inspection, comprising:

• transmitting a pressure pulse from an omnidirectional acoustic transmitter into a downhole casing, cement layer, and formation;
• measuring a first reflection of the pressure pulse at an acoustic receiver of a first array of acoustic receivers positioned a first distance from the acoustic transmitter, wherein the first array of acoustic receivers comprises a first plurality of acoustic receivers;
• measuring a second reflection of the pressure pulse at a second array of acoustic receivers positioned at a second distance from the acoustic transmitter, wherein the second array of acoustic receivers comprises a second plurality of acoustic receivers, wherein the second distance is greater than the first distance, wherein each acoustic receiver of the first array of acoustic receivers is at a different angular orientation, and wherein each acoustic receiver of the first array of acoustic sensors is circumferentially aligned with a different acoustic receiver of the second array of acoustic receivers with respect to the tool body;
• generating a first visualization based, at least in part, on the measurement of the first reflection, the first visualization corresponding to a first bond between the downhole casing and the cement layer;
• and
• generating a second visualization based, at least in part, on the measurement of the second reflection, the second visualization corresponding to a second bond between the cement layer and a formation.